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Certain Caper Forest

#165900
Notes

Certain Caper Forest (#165900) is a deep green with a jewel character. It carries the deep, saturated richness of a gemstone. Authoritative and slightly formal, it works well for type and heavy UI elements. Its HSL profile (105°, 100%, 17%) places it in the highly saturated band at a dark lightness. Best used in small doses, like logos, CTAs, focus rings, or highlight text, where its saturation becomes a feature rather than noise. For a confident two-color system, pair it with its complementary violet. For something softer, pull in its analogous neighbors on either side of the wheel.

HEX
#165900
RGB
rgb(22, 89, 0)
HSL
hsl(105, 100%, 17%)
HWB
hwb(105 0% 65%)
OKLCH
oklch(40.6% 0.131 140.1)
P3
color(display-p3 0.1693 0.3438 0.0814)
HSV
hsv(105, 100%, 35%)
LAB
lab(32.51% -36.61 39.06)
LCH
lch(32.51% 53.53 133.14)
CMYK
cmyk(75%, 0%, 100%, 65%)

Etymology

Certain
adjective

Latin certus, fixed / sure — sharing root with English concern and certify. As a color modifier, certain implies a saturated-and-unambiguous quality where the hue declares its character without hesitation. Sits at the bold-and-confident end of the grid, parallel to assured and decisive in usage.

Caper
modifier

Greek κάππαρις, Mediterranean-pickled-bud. As a color modifier, caper implies a Mediterranean-pickled-bud-and-briny-tang quality, the visual register of Pantelleria-and-Sicilian-caper hand-Mediterranean-pickled-bud-and-briny-tang Pantelleria-and-Sicilian-caper-and-Aeolian-Islands caper-and-Mediterranean-pickled-bud surfaces under Pantelleria-and-Sicilian-caper-and-Aeolian-Islands Pantelleria-and-Aeolian-and-Sicilian Mediterranean-brine-light. Sits at the modifier-and-flavor end of the grid, parallel to anise and tang in usage.

Forest
noun

The dense canopy of a temperate or tropical woodland — oak, beech, pine, eucalyptus, mahogany — wherever leaves close above to filter the light below. Forest green refers to the average reflectance of a healthy mid-summer canopy seen from below: a saturated, slightly muted green with the matte finish of layered chlorophyll. Deeper than fern, cooler than olive, with the ecological weight of a word that has named every wooded biome on Earth.

Closest matches

The nearest named color in three reference sources, ranked by perceptual distance (ΔE76 in CIELAB). ΔE < 1 is imperceptible to most viewers; ΔE > 10 is clearly different. When two sources point to the same hex they’re merged into one tile; click any to open that color’s page.

Variations

Click any swatch to explore

Harmonies

Accessibility

Color-vision simulation

How this color appears to viewers with the four major color-vision-deficiency types. Computed via the Machado (2009) physiologically-based model. If a tile matches the original, the color reads the same to that viewer.

#165900
Original
#5c5000
Protanopia
#544b0d
Deuteranopia
#08564a
Tritanopia
#444444
Achromatopsia
WCAG contrast

The color used as foreground text against pure white and pure black, with the contrast ratio and WCAG 2.1 grade. Aim for AA (4.5:1) for body text and AA Large (3:1) for 18 pt+ headlines; AAA (7:1) is the gold standard for long-form reading surfaces.

The quick brown foxSample body text at normal size. The wcag minimum for body contrast is 4.5:1 (AA) or 7:1 (AAA).
AAAon White
8.53:1
The quick brown foxSample body text at normal size. The wcag minimum for body contrast is 4.5:1 (AA) or 7:1 (AAA).
Failon Black
2.46:1

Wide gamut

Display P3 representation

The CSS Color 4 wide-gamut form of this color. Both swatches render the same color on every display — the P3 form only diverges from sRGB when a designer pushes channels outside sRGB's reach.

sRGB hex
sRGB hex
##165900
Display P3
Display P3
color(display-p3 0.1693 0.3438 0.0814)
P3 has subtle headroomOKLCH chroma 0.131

Moderately saturated colors gain a small bump in P3 — the difference is usually visible side-by-side on wide-gamut hardware but won't change the character of the color.

Related Colors

Canvas